In this analysis we work in standard collinear factorization [1]}, [2]}, [3]}, in which QCD cross sections are separated into perturbatively calculable partonic hard factors convoluted with nonperturbative PDFs and/or FFs.
We perform calculations of all observables consistently to order \(\alpha _s\)  in the QCD coupling.
Details of the basic theoretical setups for the inclusive DIS, inclusive Drell-Yan lepton-pair production and SIA reactions are provided in the literature [2]}, [5]}, and will not be repeated here.
However, since SIDIS is a comparatively novel addition to global QCD analyses, we review it in more detail in Appendix .
